12897551 has 4 divisors (see below), whose sum is σ = 12923400. Its totient is φ = 12871704.

The previous prime is 12897541. The next prime is 12897559. The reversal of 12897551 is 15579821.

12897551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15579821 = 251 ⋅62071.

It is a cyclic number.

It is not a de Polignac number, because 12897551 - 2¹⁸ = 12635407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12897559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12161 + ... + 13178.

It is an arithmetic number, because the mean of its divisors is an integer number (3230850).

Almost surely, 2^12897551 is an apocalyptic number.

12897551 is a deficient number, since it is larger than the sum of its proper divisors (25849).

12897551 is an equidigital number, since it uses as much as digits as its factorization.

12897551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25848.

The product of its digits is 25200, while the sum is 38.

The square root of 12897551 is about 3591.3160540392. The cubic root of 12897551 is about 234.5141675648.

It can be divided in two parts, 128 and 97551, that added together give a palindrome (97679).

The spelling of 12897551 in words is "twelve million, eight hundred ninety-seven thousand, five hundred fifty-one".